Removed the old supply plenum and old air handler. Replaced the air handler with a new one. Replaced the secondary drain pan. Rebuilt condensate drain and added safety float switches. Installed new in line filter dryer, pressure tested with dry nitrogen and pulled and vacuum on the copper line set. Replaced the supply plenum with a new one. Charged system to factory specifications and checked operation of the system. Installed new Ecobee Lite thermostat.